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| author | PROJ deploybot <proj.bot@proj.bot> | 2022-03-22 20:00:06 +0000 |
|---|---|---|
| committer | PROJ deploybot <proj.bot@proj.bot> | 2022-03-22 20:00:06 +0000 |
| commit | a3f43744feec86272fe532124679d3a013ef9a8c (patch) | |
| tree | 27e4198db6011e3097eb7bcfe7197684aba7583a /operations/conversions/pop.html | |
| download | PROJ-gh-pages.tar.gz PROJ-gh-pages.zip | |
update with results of commit https://github.com/OSGeo/PROJ/commit/53c07a8bd211b7aee4bc07a9c6726005504b7181gh-pages
Diffstat (limited to 'operations/conversions/pop.html')
| -rw-r--r-- | operations/conversions/pop.html | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/operations/conversions/pop.html b/operations/conversions/pop.html new file mode 100644 index 00000000..dc8680d5 --- /dev/null +++ b/operations/conversions/pop.html @@ -0,0 +1,255 @@ +<!DOCTYPE html> +<html class="writer-html5" lang="en" > +<head> + <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" /> + + <meta name="viewport" content="width=device-width, initial-scale=1.0" /> + <title>Pop coordinate value to pipeline stack — PROJ 9.0.0 documentation</title> + <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" /> + <link rel="stylesheet" href="../../_static/css/theme.css" type="text/css" /> + <link rel="shortcut icon" href="../../_static/favicon.png"/> + <link rel="canonical" href="https://proj.orgoperations/conversions/pop.html"/> + <!--[if lt IE 9]> + <script src="../../_static/js/html5shiv.min.js"></script> + <![endif]--> + + <script data-url_root="../../" id="documentation_options" 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href="../../apps/index.html">Applications</a></li> +<li class="toctree-l1 current"><a class="reference internal" href="../index.html">Coordinate operations</a><ul class="current"> +<li class="toctree-l2"><a class="reference internal" href="../projections/index.html">Projections</a></li> +<li class="toctree-l2 current"><a class="reference internal" href="index.html">Conversions</a><ul class="current"> +<li class="toctree-l3"><a class="reference internal" href="axisswap.html">Axis swap</a></li> +<li class="toctree-l3"><a class="reference internal" href="cart.html">Geodetic to cartesian conversion</a></li> +<li class="toctree-l3"><a class="reference internal" href="geoc.html">Geocentric Latitude</a></li> +<li class="toctree-l3"><a class="reference internal" href="latlon.html">Lat/long (Geodetic alias)</a></li> +<li class="toctree-l3"><a class="reference internal" href="noop.html">No operation</a></li> +<li class="toctree-l3 current"><a class="current reference internal" href="#">Pop coordinate value to pipeline stack</a><ul> +<li class="toctree-l4"><a class="reference internal" href="#examples">Examples</a></li> +<li class="toctree-l4"><a class="reference internal" href="#parameters">Parameters</a></li> +<li class="toctree-l4"><a class="reference internal" href="#further-reading">Further reading</a></li> +</ul> +</li> +<li class="toctree-l3"><a class="reference internal" href="push.html">Push coordinate value to pipeline stack</a></li> +<li class="toctree-l3"><a class="reference internal" href="set.html">Set coordinate value</a></li> +<li class="toctree-l3"><a class="reference internal" href="topocentric.html">Geocentric to topocentric conversion</a></li> +<li class="toctree-l3"><a class="reference internal" href="unitconvert.html">Unit conversion</a></li> +</ul> +</li> +<li class="toctree-l2"><a class="reference internal" href="../transformations/index.html">Transformations</a></li> +<li class="toctree-l2"><a class="reference internal" href="../pipeline.html">The pipeline operator</a></li> +<li class="toctree-l2"><a class="reference internal" href="../operations_computation.html">Computation of coordinate operations between two CRS</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../../resource_files.html">Resource files</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../geodesic.html">Geodesic calculations</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../development/index.html">Development</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../specifications/index.html">Specifications</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../community/index.html">Community</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../faq.html">FAQ</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../glossary.html">Glossary</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../zreferences.html">References</a></li> +</ul> + + </div> + </div> + </nav> + + <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"><nav class="wy-nav-top" aria-label="Mobile navigation menu" style="background: #353130" > + <i data-toggle="wy-nav-top" class="fa fa-bars"></i> + <a href="../../index.html">PROJ</a> + </nav> + + <div class="wy-nav-content"> + <div class="rst-content"> + <div role="navigation" aria-label="Page navigation"> + <ul class="wy-breadcrumbs"> + <li><a href="../../index.html" class="icon icon-home"></a> »</li> + <li><a href="../index.html">Coordinate operations</a> »</li> + <li><a href="index.html">Conversions</a> »</li> + <li>Pop coordinate value to pipeline stack</li> + <li class="wy-breadcrumbs-aside"> + <a href="https://github.com/OSGeo/PROJ/edit/8.2/docs/source/operations/conversions/pop.rst" class="fa fa-github"> Edit on GitHub</a> + </li> + </ul><div class="rst-breadcrumbs-buttons" role="navigation" aria-label="Sequential page navigation"> + <a href="noop.html" class="btn btn-neutral float-left" title="No operation" accesskey="p"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a> + <a href="push.html" class="btn btn-neutral float-right" title="Push coordinate value to pipeline stack" accesskey="n">Next <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a> + </div> + <hr/> +</div> + <div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article"> + <div itemprop="articleBody"> + + <section id="pop-coordinate-value-to-pipeline-stack"> +<span id="pop"></span><h1>Pop coordinate value to pipeline stack<a class="headerlink" href="#pop-coordinate-value-to-pipeline-stack" title="Permalink to this headline">¶</a></h1> +<div class="versionadded"> +<p><span class="versionmodified added">New in version 6.0.0.</span></p> +</div> +<p>Retrieve components of a coordinate that was saved in a previous pipeline step.</p> +<table class="docutils align-default"> +<colgroup> +<col style="width: 27%" /> +<col style="width: 73%" /> +</colgroup> +<tbody> +<tr class="row-odd"><td><p><strong>Alias</strong></p></td> +<td><p>pop</p></td> +</tr> +<tr class="row-even"><td><p><strong>Domain</strong></p></td> +<td><p>4D</p></td> +</tr> +<tr class="row-odd"><td><p><strong>Input type</strong></p></td> +<td><p>Any</p></td> +</tr> +<tr class="row-even"><td><p><strong>Output type</strong></p></td> +<td><p>Any</p></td> +</tr> +</tbody> +</table> +<p>This operations makes it possible to retrieve coordinate components that was +saved in previous pipeline steps. A retrieved coordinate component is loaded, +or <em>popped</em>, from a memory stack that is part of a <a class="reference internal" href="../pipeline.html#pipeline"><span class="std std-ref">pipeline</span></a>. +The pipeline coordinate stack is inspired by the stack data structure that is +commonly used in computer science. There’s four stacks available: One four each +coordinate dimension. The dimensions, or coordinate components, are numbered +1–4. It is only possible to move data to and from the stack within the same +coordinate component number. Values can be saved to the stack by using the +<a class="reference internal" href="push.html#push"><span class="std std-ref">push operation</span></a>.</p> +<p>If the pop operation is used by itself, e.g. not in a pipeline, it will +function as a no-operation that passes the coordinate through unchanged. +Similarly, if no coordinate component is available on the stack to be popped +the operation does nothing.</p> +<section id="examples"> +<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2> +<p>A common use of the <a class="reference internal" href="push.html#push"><span class="std std-ref">push</span></a> and pop operations is in 3D +<a class="reference internal" href="../transformations/helmert.html#helmert"><span class="std std-ref">Helmert</span></a> transformations where only the horizontal components +are needed. This is often the case when combining heights from a legacy +vertical reference with a modern geocentric reference. Below is a an example of +such a transformation, where the horizontal part is transformed with a Helmert +operation but the vertical part is kept exactly as the input was.</p> +<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ echo 12 56 12.3 2020 | cct +proj=pipeline \ ++step +proj=push +v_3 \ ++step +proj=cart +ellps=GRS80 \ ++step +proj=helmert +x=3000 +y=1000 +z=2000 \ ++step +proj=cart +ellps=GRS80 +inv \ ++step +proj=pop +v_3 \ + + 12.0056753463 55.9866540552 12.3000 2000.0000 +</pre></div> +</div> +<p>Note that the third coordinate component in the output is the same as the input.</p> +<p>The same transformation without the push and pop operations would look like this:</p> +<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ echo 12 56 12.3 2020 | cct +proj=pipeline \ ++step +proj=cart +ellps=GRS80 \ ++step +proj=helmert +x=3000 +y=1000 +z=2000 \ ++step +proj=cart +ellps=GRS80 +inv \ + + 12.0057 55.9867 3427.7404 2000.0000 +</pre></div> +</div> +<p>Here the vertical component is adjusted significantly.</p> +</section> +<section id="parameters"> +<h2>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</a></h2> +<dl class="std option"> +<dt class="sig sig-object std" id="cmdoption-arg-v_1"> +<span id="cmdoption-arg-v-1"></span><span class="sig-name descname"><span class="pre">+v_1</span></span><span class="sig-prename descclassname"></span><a class="headerlink" href="#cmdoption-arg-v_1" title="Permalink to this definition">¶</a></dt> +<dd><p>Retrieves the first coordinate component from the pipeline stack</p> +</dd></dl> + +<dl class="std option"> +<dt class="sig sig-object std" id="cmdoption-arg-v_2"> +<span id="cmdoption-arg-v-2"></span><span class="sig-name descname"><span class="pre">+v_2</span></span><span class="sig-prename descclassname"></span><a class="headerlink" href="#cmdoption-arg-v_2" title="Permalink to this definition">¶</a></dt> +<dd><p>Retrieves the second coordinate component from the pipeline stack</p> +</dd></dl> + +<dl class="std option"> +<dt class="sig sig-object std" id="cmdoption-arg-v_3"> +<span id="cmdoption-arg-v-3"></span><span class="sig-name descname"><span class="pre">+v_3</span></span><span class="sig-prename descclassname"></span><a class="headerlink" href="#cmdoption-arg-v_3" title="Permalink to this definition">¶</a></dt> +<dd><p>Retrieves the third coordinate component from the pipeline stack</p> +</dd></dl> + +<dl class="std option"> +<dt class="sig sig-object std" id="cmdoption-arg-v_4"> +<span id="cmdoption-arg-v-4"></span><span class="sig-name descname"><span class="pre">+v_4</span></span><span class="sig-prename descclassname"></span><a class="headerlink" href="#cmdoption-arg-v_4" title="Permalink to this definition">¶</a></dt> +<dd><p>Retrieves the fourth coordinate component from the pipeline stack</p> +</dd></dl> + +</section> +<section id="further-reading"> +<h2>Further reading<a class="headerlink" href="#further-reading" title="Permalink to this headline">¶</a></h2> +<ol class="arabic simple"> +<li><p><a class="reference external" href="https://en.wikipedia.org/wiki/Stack_(abstract_data_type)">Stack data structure on Wikipedia</a></p></li> +</ol> +</section> +</section> + + + </div> + </div> + <footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer"> + <a href="noop.html" class="btn btn-neutral float-left" title="No operation" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a> + <a href="push.html" class="btn btn-neutral float-right" title="Push coordinate value to pipeline stack" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a> + </div> + + <hr/> + + <div role="contentinfo"> + <p>© Copyright 1983-2022. + <span class="lastupdated">Last updated on 22 Mar 2022. + </span></p> + </div> + + Built with <a href="https://www.sphinx-doc.org/">Sphinx</a> using a + <a href="https://github.com/readthedocs/sphinx_rtd_theme">theme</a> + provided by <a href="https://readthedocs.org">Read the Docs</a>. + + +</footer> + </div> + </div> + </section> + </div> + <script> + jQuery(function () { + SphinxRtdTheme.Navigation.enable(true); + }); + </script> + +</body> +</html>
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